Webasto 12V Circulation Pump

[truk4u]

Anyone have a source for my circulation pump? I tried Grainger, can't match anything up... I'm going to call Webasto tomorrow and see if they have any suggestions. The impeller is broke and the motor has seen it's days.

5641

[jello_jeep]

I got mine @ Marathon Dallas... almost 400.00 !! I think mine was 24V ?

[flyu2there]

Try Defender Marine............

[Jon Wehrenberg]

Tom,

That is way different than mine so I suspect if you can find any 12V circulating pump that moves a similar volume it will work. I doubt if it has to be that exact model.

[dalej]

Tom,

This came from my bus diary...

January 17, 2000 Bergstrom Manufacturing Company (815) 874-7821 is the company that makes the water pumps that circulate the wabasto water. They said to call 888.466.8461
402.466.8461 that is Cornhusker Trucks to get the pumps. Part # is 6600-0784 or 868-192 talked to Brad Wayne or Jason
and ordered one on January 18, 2000 for $215.?

Mine are 12v. I have one on hand if you need to use mine until you get one.

[dreamchasers]

Tom,

On my Country Coach I replaced the bad pump with same model from March Pumps.

5650

5651

I recall the pump was $300 when purchases last year. Pricey by my standards, but the pump was high quality and the pump housing was brass. The wet area of the pump is sealed and the drive uses a magnet to turn the pump. A high quality pump,


Hopes this helps.

Hector

[truk4u]

Thanks guys, I appreciate the help. After a long discussion with Webasto, we realized that Liberty down sized the pump inlet/outlet hose attachments. The standard Webasto U-4814 pump has 1 1/2" inlet/outlet, mine has 1". So, I managed to find a pump at MP Pumps with the proper GPH that will do the job, but I'll have to make some plumbing changes due to the position of the inlet/outlets. Cost of the new pump is $235.00. Nothings ever freaking easy!:(

Next question..... After quite a bit of coolant loss when removing the pump, will there be an air problem after re-filling the system at the expansion tank? I thought I heard someone say it will kind of purge itself. I usually fill the tank, run it until hot (thermostat open) dash heat on and then top off, not running the Webasto until things settle down.

[Jon Wehrenberg]

My best success in refillling has been to fill it as much as possible, run the Webasto pump, refill, run the pump, refill, run the pump.......

There are bleeder valves up front to purge air but for me it was easier to run the pump.

There are devices that you can put on the cooling system where the radiator cap sits that will pull a vacuum on the system and you can then refill through that device,

http://cgi.ebay.com/ebaymotors/Radiator-Cooling-System-Vacuum-Purge-Refill-Kit-1536_W0QQcmdZViewItemQQitemZ270456137476QQsspagena meZRSSQ3aBQ3aSILFQ3aFRQ3a101

[dreamchasers]

If anyone has used one of these vacuum refill devices, please post your experiences. When I change antifreeze this winter, I am considering purchasing one.

Hector

[phorner]

Just one caution, make sure the pump is rated for HOT liquids.... not all case/impeller components are suitable for hot water, as most manufacturers assume that the pump will not be used for heated liquids.

I'm sure you don't want to make this change again anytime soon...

[ken&ellen]

Tom, Parliment has a 12V Webasto pump on the self $206. according to their website. Ken & Ellen

[truk4u]

Paul - Message received... MP Pumps makes these for Webasto, so I'm good with the hot water.

Ken - Most likely the Parliament pump is 1 1/2" inlet/outlet.

[truk4u]

Finally got my circulation pump changed out and thought I would share my findings. The plastic impeller in the old pump had broken off and the pump was struggling to turn taking high amps to run.

The whole job cost about 250.00 bucks... The new pump manufacturer is MP Pumps. They make pumps for Webasto. The Distributor I bought from was Ohio Transfer & Pump. This pump has 1 1/8" inlet/outlet and if you buy the pump from Webasto (U-4814 or U4816) for the 2020 heater, the inlet/outlet is 1 1/2". So make sure you know what your pump inlet/outlet size is before buying.

Here's the website for the pump:http://www.mppumps.com/non-html/catalog/transportation/catalog_trans_schoolbus.pdf


5754
New pump pulls 2.7 amps

5755
Old pump pulled 16.4 amps trying to run

NOTE - Be careful to not reverse the wires from the Webasto to the circulation pump. Black = + and Brown = -.

[Coloradobus]

Ohhhhh!!! Ouch!!!! Wish I had known this a week and 1/2 ago. Went out to Aquahot and bought a new pump for $500.00. I asked why so much and Lonnie of Aquahot said this is what Webasto sends them Hmmm, I feel ripped off!:eek::mad: I know they need to make a few bucks, but reeeaalllyy!

[gmcbuffalo]

Tom
Looking at your old thread here with the last Pic of the broken impeller, did you figure out why it broke? These are centrifulgical pumps and work by creating a center low pressure and high periphial pressure hence the loaction of the inlets and outlets. You can block the inlet or outlet and these pumps and they will not break anything like a positived displacement pump will.

[gmcbuffalo]

Tom is this pump in addition to the Webasto pump in the Webasto housing? The only other additional pump that I have is the Prevost pump in the ceiling of the first bay that is operated a water pump switch on the dash with the heat controls.

[Jon Wehrenberg]

Every converter appears to address Webasto coolant circulation in a different manner so I am not sure anyone can generalize about pumps, their location or even their types.

[truk4u]

Greg,

I don't know what broke the plastic impeller, but my guess is the pump just got too hard to turn and the motor kept cranking breaking the shaft. The motor was also at it's end of life. This may have been the original equipment from 94.

This pump on my Liberty is mounted on the opposite side of the engine compartment from the Webasto. Like Jon said, there are many different configurations by the Converters.